Color simulator needed

Hi all,

I have an Opencart 2.0.1.1 template installed and ready to go, but I am missing one more thing: I am selling wall decals (wall stickers) and it is very important to have a color simulator integrated. Like you can see here:
http://www.lipicios.ro/cumpara/flower-power-2224577
http://www.wandtattoo.de/wandtattoos/sp ... -haus.html
http://www.wall-art.de/wandtattoo/Wandt ... hause.html

Can somebody help me where to find (preferrably a free one)?
Thanks in advance!