Its a lovely idea to get a celtic knot tattoo. I’ve got one myself too… very small one though. I could suggest you some websites where you could find many nice designs for tattoos. These are basically websites for temporary tattoos, but of course you could get your Tattoo Artist to make a permanent one with the same:
http://www.picassoexports.com
http://www.tattoomanufacturers.com
http://www.temporarytattoos.in
You could also have a look at http://www.picassopromos.com for more of logo/promotional tattoos that companies use these days to promote their brand.

Hey!

I’m Niraj Gera. My company’s name is Picasso Exports. We manufacture and export all kinds of Temporary Body Tattoos. Our product range includes: Water Transfer Tattoos, Henna Tattoos, Glitter Armband Tattoos, Crystal/Rhinestone Stickers, Promotional Tattoos, Henna Stencils,Designer Nail Art etc. You can contact me through my website for all kinds of Custom Tattoo Designs, Logo Tattoos for corporates, Glow In dark Tattoos – http://www.picassoexports.com !

Its quite a nice design, but something makes it look a bit incomplete…. I can’t seem to explain what:confused: . So I guess you could take help of a professional, who could improve upon your existing design and also make a temporary tattoo out of it….. Visit this webpage, might help- http://www.tattoomanufacturers.com have Fun!!