So here is the Linux Mint theme tutorial.
I'll try to do the best I can. I apologise for the hugely different websites - I'm just doing a google search and gathering/foraging for whatever I can.
First a little prep is in order.
- Download the raspberry pi wallpaper. Put it in /usr/share/lxde.You should recognise it from Debian Squeeze.
- Next, you'll have to get the raspberry pi icon. This should also go in /usr/share/lxde.
- Now some nitty gritty stuff. Open up a LXTerminal and run (sudo if non-root) apt-get install obconf openbox-themes. This will get some thmes for the R-Pi and a manager to use them.
- First the background. I hope that this picture makes it clear. It's the Wallpaper box. Click Browse and find /usr/share/lxde and choose 'Raspi-background-tomg.co.jpg'. Click OK. You should have a Raspberry Pi background to play with.
- Next right-click the icon at the very bottom left corner. Select "Menu" Settings from the menu. This should give you a pop-up with another browse button. Guess what you have to do with it? Yup, Click it, go to /usr/share/lxde and select raspberry-pi.jpg. Click OK. You should have a raspberry pi icon where the LXDE icon used to be. (I'm sorry - if anyone could suggest a transparent bordered R-Pi image it would be greatly appreciated.)
- This is why I asked you to get OBConf. Open a terminal if you haven't already done so, and type 'obconf' (without the quotes) OBConf usually complains about assertions failling and stuff like that. Ignore it, it will launch fine regardless. Once OBConf has launched, find the 'Simply-Red' theme, and select it. Click OK, and you're done.