Have you seen this. geoGreeting, a site that uses the shapes of buildings as seen from above to spell out your message.
I think this one is perfect for spring/summer. The Butterfly Alphabet. You can order pictures, posters, and send e-cards. And you can choose the butterfly alphabet
or the nature alphabet
Helvetica is great, so clean and simple. Anything Crate & Barrel uses is good enough for me. But sometimes you need a more decorative font. I love this site. They have so many cute fonts and themes. And they're FREE!!! I just spent about 2 minutes looking around and found all these. Imagine the possibilities.