Don't take this the wrong way as I may come of strongly but I mean no harm. This is a horrible tattoo idea unless it is pretty big. If the tattoo is too small then eventually you'll have a black blob .
The really talented dudes over at the TSF Crew have created a series of awesome new optical illusion street art pieces. Check them out, and the videos to see the making: Check out more of the TSF Crew's stuff at their website: TSF CREW OFFICIAL WEBSITE