Icon Tutorial 03 - Quick Color Variations
This icon tutorial was made for Photoshop but should apply to other graphics software as well.Step 1: Crop the image and sharpen once.

Step 2: Apply Image > Adjustments > Varitations. First click 'Original' to reset the settings. Then click More Cyan and then More Yellow.

Step 3: Put this gradient on Color Burn, 100%.

Step 4: Put this gradient on Color Burn, 100%.

Step 5: Fill a new layer with #E6D5BA. Set it to Soft Light, 100%.

Step 6: Duplicate the original cropped base and bring the layer to the top. Set it on Screen, 50%. Duplicate that layer, set it on Hard Light, 50%.

Step 7: Add text. I used the font Georgia. The 's' is at 60 pt. 'ydney' is at 7 pt.

Step 8: On a new layer, apply a soft round brush at the lower left corner in white. I used 125 px, but only applied the edge of the brush onto the icon.

Step 9: Add a white border around the icon.
And you're done :) Let me know if this tutorial was helpful, and post the icons you made with it.
Here are some quick ways to get different results. First, flatten the image.
Please feel free to comment with your results at my LiveJournal.
Original image from Sydney Bristow HDTV Capture.