Easy... throw it and done, these kind of grenades are easy to find on instructables but just did find one with orange pieces on it =D
Step 1: Grenade =D
First take 2 of these.
Then just clip them in eachother
Then slide an orange weird thing in it
then put more on it
and more =D
Step 2: Finished!
Finished, if you did it well the orange pieces should blow up every where, when you throw it