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After seeing the ones featured in Dan Browns Angels & Demons I had a go at making some myself. For those who aren't sure what an ambigram is it is a word which reads the same even when rotated 180° (turned upside down)
I've tried doing ones of my full name and other names, some work well and some don't. They are very grainy because I did them in paint, they obviously look much neater handwritten. Here's a couple of others I tried:

NEIL ERIC LAWTON - Some of those letters don't work too well, specifically the L/W

RAQUEL - Not too bad but I think that the R/L could be a little more curved

raquel santos - Possibly the best I've done because her name is perfect for this

Gareth - This one isn't too bad except perhaps the a/t

Gary - This one worked ok, quite stylish I think

Sinead - This one is quite stylish too I think, quite a difficult one to do

bon jovi - not too bad, perhaps the j needs work though
This one isn't too good but I couldn't resist making it

I AM BORED :P