Man I painted a few of my scrap bats just like that like a month ago.
They are not pro or anything like that, I was just killing some boredom by putting some scrap parts to use.
I swear my Idea was practically the same thing. I'd love to post the picture and show ya but I tried last month and could not figure it out so I just gave up. If anyone feels like explaining the picture posting part of this site it would be greatly appreciated.
You need to host your picture in a Picasa / Photobucket / Flickrr / ... album. Then, copy the URL of your picture. Use this button
and paste your link. The process is almost the same in all boards.
Just want to add some to Martin's explanation:
Before posting, make sure that your picture is already uploaded on another site like the ones that Martin has mentionned.
Second, when creating a new post on the boards, click on "insert image" in the menu ( it shows up on your screen as an Icon as Martin already showed it to you:

).
After clicking, the following will appear in the text box: [ img ][ /img ].
Copy paste the URL in it as follows:
[ img ] paste the URL of picture here [ /img ]
You should be able to view the picture when you preview your post. Works everytime for me.