I am not the most gifted artist, but I do like things to look good. One of the easiest sites I have found to make custom text or banners is CoolText. Its easy to use and only takes seconds to have a working banner.
Here is an example... I know its a little over the top
Zapd allows you to create mobile websites from your iPhone or iPod Touch. This FREE app will enable you to create mobile content anytime anywhere. Create a mobile classroom website or let students create projects directly from their iOS device.