I need to get a coverup tattoo; what kind of tattoo will best hide my original?

I have a palm sized colored (violent and blues) theater masks on my right shoulder. Should I be looking for a tattoo with big black ink blocks, or something with a lot of color and detail?

And if you can suggest some free tattoo design sites, that would be helpful too!

i am having some stuff covered right now and it’s amazing what can be done. you may end up just having to have a much larger piece put on your back and the masks you have now can be worked into something else. maybe black hair of a pinup or a geisha? i don’t know what it looks like so it’s hard for me to say. but good luck with your coverup!