Would be nice to have a thumbs-up/thumbs-down icon either side of the ascii art image so that you can vote up and down the items. Would make moderation less important.

It should have an area to insert HTML coloured ASCII like you find on http://c6.org/toogle

Should be able to select postcard background colour and text colour.

Add some form of spam protection, perhaps a delay on multiple submissions from same IP?

Upload jpg or png and convert to ascii

So for example I could search for all the art with "dog" as part of its title and have a page just showing those, rather than having to look for the dogs amongst all the non-dog art.

Would be nice to have a warning show up on the create page if you accidentally leave when you've not finished making your ascii art.

Tags will make it easier to search and filter for stuff you're looking for.