Stuff you'll need:
+ Image editing software - anything from Paint to Photoshop will work.
+ This file - This is the Gamercard template I made. It doesn't include stuff like "Reputation" and "Zone", because those are only for Xbox Live. DON'T USE THE IMAGE ON THIS INSTRUCTABLE! It is for a preview only, because the quality sucks.
+ An avatar
+ Various images, I'll explain which ones you'll need in their respective steps.
Step 1: Add Text
I also put in a link to my Instructables profile, as I use this as my "home" on the intertubes. Go ahead and put in the URL for your website or something. There's also another field under the Gamerscore area, which can also be used for whatever you want.
Step 2: Get Icons for Recently Played Games
I got the first icon by searching for mygamercard.net tile ace combat 6 on Google Images. Tile is the name for the icons at the bottom of your Gamercard. In this particular search, I was looking for a tile for Ace Combat 6: Fires of Liberation. The first picture in this search is the tile for Ace Combat 6, the rest are for achievements or other games. The size for any type of tile is 64x64 pixels. Remember to click the picture then go to the actual picture, not the preview picture on the search page.
Once you have your tile, resize it and place it in a blank space. Do this with your avatar too.
NOTE: The Halo 3 icon just means that I've played it recently. I don't own it yet.