For people asking about the chat theme, it actually isn't a theme, that takes about 20 seconds to do.
Attached are the 2 things you need, and you need to have SSH access to your phone.
SSH into your phone and go into your themes folder. Create a new .theme for example "blueSMS.theme" (without the quotations obviously)
Inside the .theme folder, drag and drop the background I attached, which is already named correctly, just change the extension from .jpg to .png, for some reason it told me I couldn't upload it as a .png.
then inside the .theme folder, create a folder called "Bundles" - inside of that, create another folder called "com.apple.chatkit" and drop the chat bubble .png i have attached, it is already named correctly and you don't have to change the extension on this one, it's beyond me why it let me upload this one ok and not the other.
as for the font, download the app fontswap from cydia and the font is the simpsons font, which is also available through cydia.
then respring, go into winterboard, and apply the theme you just created and respring again
the themes i'm working on will be a lot more detailed than this and very complete but they will flow through to where the icons, backgrounds, chat apps, and general theme will all flow through with the same colors and elements. i'll keep you all updated