Here's a mini how-to for turning small fake pumpkins and gourds into treasured autumn and Thanksgiving decor through decoupage. I've used Japanese yuzen papers in fall colors and motifs - maple leaves, chrysanthemums, acorns, gold, red, orange, green, and cream.
Detailed instructions for decoupaging eggs abound on the web and youtube. I just adapt the paper size to fit the object. The smoother and more regular the surface, the easier it is to get the paper to adhere smoothly, which is the look I prefer.
Apply adhesive (I use Mod Podge) down the solid center of the paper and press paper to gourd. Be careful not to pull the paper too tight or there will be gaps where the object will show through.
Use a bone folder to smooth seams and ensure a good bond between paper and object.
Cut each end into "picket fence" points and glue in alternating pattern, smoothing with the bone folder as you progress.
Make small cuts where necessary to ease excess paper around the bumpy parts. Yuzen is very flexible, so you won't need to do this very often.
Once all the picket fence pieces are cut and glued, use the bone folder for a final smoothing over the whole pumpkin, then apply a coat of Mod Podge as base sealant.
Paint the stem with a metallic paint in a complimentary color. After the stem is completely dry, reattach it with adhesive, and touch-up stem if needed. A finish coat of acrylic paint-on or spray sealant gives the pumpkin a soft sheen and extra durability.