This a way to make an old bike helmet into a 1-up or any other kind of mushroom you like.

Step 1: Materials

Old bike helmet
Large and small paint brushes
White paint
Color choice paint(I'm making a super mushroom, so I'm using red)
Spray on gloss finish(optional)
Sandpaper
Plastic ring(I made mine out of a peanut butter jar, it was perfect size)
Paint can opener

Step 2: Prepair the Helmet

First, remove any unwanted stickers on the helmet. Then sand the helmet so the paint stays on. After, remove the foam on the inside(the helmet I used was very old, so you might no be able to remove the foam. If you can't its not that big of a deal).

Step 3: First Coat

Start painting the helmet using the large brush. Once the whole outside is done, look inside and clean out any paint that went through the holes. Now find something to sit in on. I used a large coffee can and that worked great.

Step 4: Next Coat

Now just add as many coats of paint as you would like. I am only going to do two coats.

Step 5: Paint the Circles

Find a spot to make the circles. Take your small paint brush and paint inside of the plastic ring. Paint will drip down the sides so always have paper towels ready, also don't worry about dripping too much, you can always use the red and paint over it again. I would also recommend only painting one or two circle at a time. After you paint them all wait about an hour for them to dry a little.

Step 6: Touch Up

Use the small brush again to completely fill the circles in. You may want to do this multiply times. Let this completely dry.

Step 7: Touch Up Agian

This time we are going to touch up the red. Use your large paint brush again and paint over any of the drip paint and parts that chipped off. Let this completely dry.