Firstly , you'll need a model . In my case , my toy giraffe :D

& a piece of see-through coloured paper .
These are real easy to find at any stationary shop .

Use the see through paper & cover the flash ( I used red , jut because I had it at home already )

& voila (:

You can also put it over the lense & it'll make your picture red :P

& if you crumple it & place it infront of your lense , you'll get this artsy effect .

Looks kinda vintagey , maybe I should've tried this one with yellow instead :S