Go out and choose an unfamiliar object (in other words, one you have no history with) that strikes you as ugly, repulsive, annoying, etc… some ideas might be: a wad of squashed gum on the pavement, a dead squirrel on the side of the road, an ugly sign, a loud construction site, a tacky sculpture in a charity shop… and write about it in such as way as to make it appealing to your reader. Really sell it! Use whatever words you want and cheat as much as you want, but do your best!
Hm. I'm sitting here, struggling to think of something. Double hm. Triple hm. (Don't worry, I'm not going to go on in this vein for too long.) Well, I'm going to resort to something I saw last night on the Tube. You can always count on the London Underground for something repulsive.
The aromatic fumes grab my nostrils and turn my head. A succulent bit of roasted beef pokes out of a brightly coloured carton. Kermit-green lettuce clings artistically to its side and little bits of meat-mess adorn the bun. Oh, the perfectly toasted, golden bun. Sure, it's half gone but that just makes it that much more valuable.
My belly grumbles in response. Um, um... Burger King.
Right, I just need to make it clear that I DID NOT eat this. Yuck-o.