Ambigrams
I don't post as much on B3ta as some people, but when I do it's often an ambigram - a word that can be viewed in more than one way, often upside-down as in

I've made these for years and I don't know why I can do them. It's a pretty good party trick to do with people's names, and in fact was something I did at a party to impress a young lady who since became Mrs Flatfrog and the mother of my two Flatspawn.
(lots more examples on my profile page - I make them on request when I get a bit of spare time, so feel free to gaz me)
( flatfrog Staring vacantly into space, Tue 23 Nov 2010, 10:14, 11 replies)

Looking at your profile
I am genuinely impressed (honestly, it's hard to convey sincerity in text). I'd be surprised if you could make something with my username though
( sandettie light vessel automatic New Twitter - @bollocksreally, Tue 23 Nov 2010, 10:23, closed)

... Yes, that might take some time
Funnily enough, though, long ones tend to be easier, there's more scope for moving the boundaries around. The hardest thing is non-words, a common occurrence with usernames. I failed dismally with Dekionplexis.
( flatfrog Staring vacantly into space, Tue 23 Nov 2010, 10:29, closed)

Not mine, obviously, but I thought this one was rather clever:


( Happy Phantom has been to Hastings, Brighton, and Eastbourne too, Tue 23 Nov 2010, 10:24, closed)

Oooh, that's a really clever one
There's a beautiful one on The Princess Bride 20th anniversary DVD
( flatfrog Staring vacantly into space, Tue 23 Nov 2010, 10:35, closed)

Now there's your market
t-shirt designs.
( sandettie light vessel automatic New Twitter - @bollocksreally, Tue 23 Nov 2010, 10:39, closed)

Very clever. Also works as a review of the film
( Happy Phantom has been to Hastings, Brighton, and Eastbourne too, Tue 23 Nov 2010, 11:06, closed)

Humph
You lose brownie points for this remark. To dislike this film is inconceivable.
( flatfrog Staring vacantly into space, Tue 23 Nov 2010, 12:31, closed)

Have ye seen this one?

( .Yeti., Tue 23 Nov 2010, 10:41, closed)

Nice - although would work better on a door hanger than a mat, I think
Shame the o in Go doesn't quite work.
( flatfrog Staring vacantly into space, Tue 23 Nov 2010, 10:47, closed)

I have that mat!
that is all
(Buftoon posted this on, Wed 24 Nov 2010, 19:20, closed)

Flatfrog is awesome at these, check this out -

(bROKEN aRROW PUA HVI Master, Thu 25 Nov 2010, 9:34, closed)