If you’ve grown tired of the standard calculator skin on your iPhone and want to freshen it up a bit, you can download some new skins for it.

Standard Calculator:

Jonas Calculator Skin. Download Here.

Aqwoah Calculator Skin by Reinhold Penner. Add Following Installer Sources depending on your firmware.
AlohaSoft 1.0.2: homepage.mac.com/reinholdpenner/102.xml
AlohaSoft 1.1.1: homepage.mac.com/reinholdpenner/111.xml
AlohaSoft 1.1.2: homepage.mac.com/reinholdpenner/112.xml

Here are some mods of the matte SMS bubbles I posted about earlier incorporating some comic strip characters like Calvin & Hobbes and also Dilbert and Dogbert. Four different SMS Bubble colors are included in the zip file for each character. To install, unzip and upload via sftp into the Applications/MobileSMS.app folder of your iPhone.
Download Below:

Earlier in November when Joshua Bryant posted about iChat-Matte bubbles that he’d developed, I quickly got the idea to modify and posted the revised ones for the iPhone as the current ones, although nice eye candy with their shiny, glossy goodness, made reading SMS messages hard. Now Joshua has released an iPhone version of his original iChat-Matte bubbles.
Read Here.

For people wanting to replace the glossy SMS bubbles that came standard with your iPhone with some less shiny ones which make the SMS messages easier to read in my opinion, i’ve adapted the original SMS bubbles with these from the developer of iChat Matte.Give full credit to the developer of the matte SMS bubbles. To install, you need to SSH into your iPhone and overwrite Balloon_1.png and Balloon_2.png in your Applications/MobileSMS.app folder.
Download Below:

Stock SMS bubbles:

Matte SMS bubbles: