I have found that I can use any image I posted on deviantART (they have a free, and paid account... I use paid, but both work) as well as any of my photos posted on Facebook.
It's easy to do... just right click on the photo you want, select "copy image location" and then copy it between the "img" prompts, just like you did with photobucket.
This one is on deviantART:

This one is from Facebook:

This is also from Facebook (because I'm just kinda showing off now)

Seriously, pretty much any (as in most) social media you use that allows you to post a photo, can host that photo for here.