oh, ok so "2" for color means I can use pieces of width 2. Thanks a lot, that wasn't clear to me at all.

I think it should be 36 as well. @Voile showed this solutions:
111122
112211
221111
222211
221122
112222

but how can that be correct if you can only use 2 of each color?

[Javascript] I think you might want to add to description that if source list is just a single Node then after running the function source should be an "empty" Node not a null. Of course it's not possible to set source to null while doing it in place but just to be clear on that.

Functions in description for javascript version should be lower case for consistency: sortedInsert() and insertSort() instead of SortedInsert() and InsertSort().

Very nice kata, I learned a lot. I think this is the hardest one on level 5kyu so far.