Firstly grab an old pencil case or one that is plain/boring...like
<---This one :)

Get your paint brush and mix your white,blue and red acrylic paint together =D

Or do whatever color you want! :)

<----- LILAC!! :D

Painting timmee :)
Start to paint your pencil case...

Finished!! i covered this side of the pencil case with 2 coats of lilac paint.

Now draw a light out line of the cartoon character or pattern you want on your pencil case :)
i chose a cute lil chibi from the internet :) the outline doesn't have to be perfect cuz you'll be painting it afterwards :D

Paint your little character!
After you've finished painting your character go over over it with a sharpie and black paint-- sharpie is much easier.

My pencil case was looking a lil plain
so i added some doodles :)

For the back of my pencil case i was going to paint it white but there was an ink spillage before and i painted over <---- it tuned out like this so i advise you to wash your old pencil case before you paint it or it will come out like that :'(...

So i started to paint the back black:D

All done :D
I also gave the back of the pencil case 2 coats of paint as well

i painted stripes on the side of the pencil case....

...And on the zip... :)

Let it dry....

And were done...YAY! :D