Like ImWaqas said, canonical tags should be put in, all pointing to the default or most popular color. As for the URLs, I would avoid keyword stuffing the url with synonyms, try something like this:
http://www.mokee.eu/cheap-baby-crib-scandinavian-minimalist.html
However, you should do some keyword research on your target market to determine which terms are popular for your target audience like baby vs. infant, crib vs. cot, cheap vs. low cost, etc.
Hope this helps,
Chris