I got this idea from a pin I saw here on Pinterest.
I started with a plastic garbage bag, filling it with scrunched up newspaper, then tying it closed at the top. I added a cone of scrap cardboard for the stem. Then I tied twine around my bag to create the pumpkin creases. After this I covered the twine with masking tape.
Next step was the paper mache. Using a paint brush to apply the flour/water mixture make the process I little less messy.
Then I put my pumpkin outside in the sun to dry, turning if after a few hours to ensure underneath dried too. Now her is where I admit I was a bit lazy and didn't bother adding any more layers. I just dove straight in to painting my pumpkin white. In hindsight, I should have put more paper in my bag to begin with as the paper mache began to sink a bit when I was painting it. But I guess this also added character, well, that's my excuse.
When it was dry I went over the creases with black marker to add a bit of detail.
It's fragile, but good for adding to my halloween porch display tomorrow, and best of all it didn't cost anything to make!