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.

Aaron Jang has released weTool, a native iPhone application that enables you to delete individual sms and call entries along with the ability to forward SMS messages to multiple recipients, a feature that Apple hasn’t implemented as of yet. It also gives you an option to save your sms messages to your notepad and the transition effects between switching screens is pretty cool. The download is only available as a pxl file on hackint0sh Now available on Installer. Point Safari at or add Source via Installer as http://app.weiphone.com/installer/ . Two downloads are below with the first download having a circular rotation transition between screens and the second having a page flip transition effect. Let Aaron Jang know which transition effect you like better on the poll so maybe you can influence him to incorporate it in his newer release. According to Aaron, he’s got more than 15 different page transitions. Hopefully those will be available on future releases. V0.3.7.1 now available with 17 different user selectable transitions along with a different menu system. 

Home Screen: V0.3.7.1 

SMS List:

Menu To Forward SMS Message To Multiple Recipients.

One Of The User Selectable Screen Transition Effects Available.

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:

For people having problems with flash sms messages and need to delete the problem offender or just want to delete a particular SMS message without deleting the whole conversation, you can use this. Fire up Installer and download it thru there.

Description From The Site:

This is one of the missing feature in iPhone SMS application. I am sure Apple will add it sooner or later. But I wanted to learn objective C and things like that so I went ahead and did this.

It is really simple and unpolished as of now. When you start the app, you’ll see a list of SMS (latest on the the top). It will try to resolve the number from the address book and if a matching entry is not found then number is shown as it is. Just select the message that you want to delete and it will take you to the message screen where you can delete that message.