Do you have unused or old laptop. This is simple but a nice way to reuse plus it looks nice. This was made about 4 years a go, but still works good.
I use old IBM P2 laptop, with 128Mb ram and 300Mb hard disk..
Windows 98SE, Win 98 Lite (add on), Irfan View (+ loading/batch script), VNC.
Windows lite (http://www.litepc.com/). This is a nice tool that will strip down your old Windows 98 SE to be fast and stable system. Since you will only do slide shows this works great. My photo frame boots up and start slide show in less then 20 sec. Also, I installed VNC which is not must but a nice way to remote control the photo frame. Win 98SE + Lite gives an old and slow laptop a new life, also solves problems with finding new drivers for old laptops.
Get or order a basic photo frame. I recycled the old frame and just got new black cardboard edge. You could also get these from crafts shops or IKEA.
The goal was to keep the laptop in one peace as much as possible. Simply remove the LCD from laptop hinges and turned it around. Be careful with this since LCDs are attached by ribbon cable which breaks easy. I will not post how-to for it since every laptop is different, but you should goole for it before you start the project.
Build a small frame to fix laptop to it. Used cheap angle profiles to secure the frame and laptop.
Connect a push button to laptop off/on switch. I soldered my directly to board.
Added WiFi card for easier administration and updated.
My other DIY projects with OLD laptop.