iconStiX is a custom icon tool to combine images, shapes & text and attach the composition to desktop items such as folder. You can use the app normally or as Finder's services.

Features:

• multiple objects (image, shape and text) can be added and ordered in a list
• edit the objects in various way (move, resize, rotate, skew, color, shadow, change font)• a retouch tool (overdraw or erase specified color)
• preview of scaled images
• attach / remove custom icons (read/write permission is required)
• possible to change the max icon size to reduce memory use (refrain from high quality)
• saving own documents to be used as template (QuickLook compatible)
• export as image (icns, png, tiff)
• a separate panel to keep favorite icons
• Finder services: copy, attach, remove, and open

Requirements:
OS X 10.9+
64-bit Intel

Also available is:
Intel version 2.3.2 for OS X 10.6 - 10.8