If after that time you are not sick of the sight of it then you can consider getting a real one. It's kind of a dry run if you like. If you find that you hate it, then there's no permanent damage to your skin and it will be fade from sight in a few weeks.
You can involve the whole family!
[unintentionally funny product ad follows]
http://www.beldecal.com/tattoo_paper.cfm
I’m no fan of tattoos, but that’s a good idea. Also, henna work can be changed every so often.