How hard to create an App like this for signwriting?

[Dal123]

Hopefully in a couple of months I'll have a little time to create my second web-site, which will be a part-time hobby of mine hopefully if I can manage to get some spare time.
I want to create an application like this http://www.vansignsonline.co.uk/ when you click on 'go'. You can create your own design. I wonder how hard this is, as this would take all the design aspect out of my sign for those wanting economy signs. Anyone ever done anything like this? Would I use Flash or a different programme?
Input appreciated and your general opinions .

 

[UTclassof89]

Most applications like that are done in Flash (though I don't think that specific one was). I did something similar for Chili's a few years back:
http://www.mercurygraphics.com/chilis/paint.html
It's not something for the faint of heart (or anyone brand new to Flash)

 

[Cabbit]

This can be done using the HMTL Canvas and Javascript. As with Flash you will need to put a lot of work into it but the HMTL rogue will be more forward compatible and a more interesting exercise in learning new technologies.