I am a lifetime member of the following sites
(some allow tubing...no special license is needed)
Pixel Whispers
Tinsel Town
Pixeled Creations
Roxane's
Roxane's Dreamland Tube License
Gypsy Pixels
Angelic Designs
Pixel Patch
Sassy's World
Tuts and Lines
Tube Town
Pixel Hugs
Glennda
Majestic Country Graphics
Folk Art Treasures