Step 1:
After your base looks
how you want it. Make a new fill layer #CE9C60 set to soft light @ 100%.
Step 2:
Next add a new fill layer #0A0E30 set to exclusion @ 100%.
Step 3:
Next add a new fill layer #E0BF9F set to multiply @ 59%.
Step 4:
Now add this texture I made from a photo, set to screen @ 100%.
Step 5:
The last thing to do is add a 1 px. border and your done. Feel free to add text to your icon if you wish tho.