Cfrgtkky

For my theorems and section titles, I use i.e.

usepackage{listofitem}

setsepchar{,}

readlistmycolors{amaranth,blue,orange,purple}



definecolor{amaranth}{HTML}{a82337}

definecolor{orange}{HTML}{BF7F00}

definecolor{blue}{HTML}{016FB9}

definecolor{purple}{HTML}{603C96}



usepackage[explicit]{titlesec}

titleformat{subsection}{

normalfontLargebfseries}{}{0pt}{colorbox{mycolors[thesection]!10{thesubsection  #1}}

to make my headings change color with each section (from this answer.

Now, I use the same specifications for my bclogo environments:

usepackage[tikz]{bclogo}

begin{bclogo}[logo = bclampe, couleur=blue!10,arrondi=0.1, couleurBarre=blue!10,noborder=true,ombre=true]{Idee}

 Some text.

end{bclogo}

Now, I want to define a new environment, which looks like this and changes its colors with each section like my section titles, so I don't have to write all the options every time I use this environment.

MWE:

documentclass[a4paper,twoside,ngerman]{article}

usepackage{amsmath,amsfonts,cancel,mathtools,framed,mathabx,array,amssymb}

usepackage{enumitem} % einfacher Nummerierung verändern

usepackage{tikz} % zeichnen

usetikzlibrary{cd} % kommutierende Diagramme

usepackage{listofitems} % für Farben für Kapitel

usepackage[tikz]{bclogo} % Kästen für Errinerung etc.



usepackage{babel} % neue Rechtschreibung, Worttrennung

usepackage[utf8]{inputenc} % Inputencoding

usepackage[T1]{fontenc} % Umlaute

usepackage[bookmarks=true,colorlinks=true,linkcolor=black]{hyperref}



usepackage[thmmarks,framed,thref,hyperref]{ntheorem} % [thmmarks] guarantees endmarks



%theorems

usepackage{tcolorbox}

tcbuselibrary{theorems}

newtcbtheorem[number within=subsection]{thm}{Satz} 

    {{colback=mycolors[thesection]!5},

    {colframe=mycolors[thesection]!95!black},

    fonttitle=scshapebfseries,

    before skip=15pt plus 2pt,after skip=15pt plus 2pt}{th}



setsepchar{,}

readlistmycolors{amaranth,blue,orange,purple}



definecolor{amaranth}{HTML}{a82337}

definecolor{orange}{HTML}{BF7F00}

definecolor{blue}{HTML}{016FB9}

definecolor{purple}{HTML}{603C96}



% formatting

usepackage[explicit]{titlesec}



titleformat{section}

{normalfontLARGEbfseriesraggedright}

{llap{colorbox{mycolors[thesection]}{makebox[3em][r]    {textcolor{white}{thesection}}}hspace{1em}}}

{0pt}

{#1}



begin{document}

section{first, red section}



begin{bclogo}[logo = bclampe, couleur=amaranth!10,arrondi=0.1, couleurBarre= amaranth!10,noborder=true,ombre=true]{Idee}

 Some text.

end{bclogo}



section{next, blue section}

begin{bclogo}[logo = bclampe, couleur=blue!10,arrondi=0.1, couleurBarre= blue!10,noborder=true,ombre=true]{Idee}

 Some text.

end{bclogo}

end{document}

Instead of using a list of colour names, I would simply include the section number in the colour name. Then you can use it like couleur=mycolthesection!10 to mix the colours of the bclogo boxes

documentclass[a4paper,twoside,ngerman]{article}

usepackage{amsmath,amsfonts,cancel,mathtools,framed,mathabx,array,amssymb}

usepackage{enumitem} % einfacher Nummerierung verändern

usepackage{tikz} % zeichnen

usetikzlibrary{cd} % kommutierende Diagramme

usepackage{listofitems} % für Farben für Kapitel

usepackage[tikz]{bclogo} % Kästen für Errinerung etc.



usepackage{babel} % neue Rechtschreibung, Worttrennung

usepackage[utf8]{inputenc} % Inputencoding

usepackage[T1]{fontenc} % Umlaute



usepackage[thmmarks,framed,thref,hyperref]{ntheorem} % [thmmarks] guarantees endmarks



%theorems

usepackage{tcolorbox}

tcbuselibrary{theorems}

newtcbtheorem[number within=subsection]{thm}{Satz} 

    {{colback=mycolnumbervalue{section}!5},

    {colframe=mycolnumbervalue{section}!95!black},

    fonttitle=scshapebfseries,

    before skip=15pt plus 2pt,after skip=15pt plus 2pt}{th}



definecolor{mycol1}{HTML}{a82337}

definecolor{mycol2}{HTML}{016FB9}

definecolor{mycol3}{HTML}{BF7F00}

definecolor{mycol4}{HTML}{603C96}



% formatting

usepackage[explicit]{titlesec}



titleformat{section}

{normalfontLARGEbfseriesraggedright}

{llap{colorbox{mycolnumbervalue{section}}{makebox[3em][r]    {textcolor{white}{numbervalue{section}}}}hspace{1em}}}

{0pt}

{#1}



usepackage{etoolbox}



newenvironment{mybclogo}[1]{%

    begin{bclogo}[logo = bclampe, couleur=mycolnumbervalue{section}!10,arrondi=0.1, couleurBarre= mycolnumbervalue{section}!10,noborder=true,ombre=true]{#1}

}{

    end{bclogo}

}



usepackage[bookmarks=true,colorlinks=true,linkcolor=black]{hyperref}



begin{document}

section{first, red section}



begin{mybclogo}{Idee}

 Some text.

end{mybclogo}



section{next, blue section}

begin{mybclogo}{Idee}

 Some text.

end{mybclogo}

end{document}