Canon's 50mm f/1.8 EF-II lens gives a lot of green ghosting and flare when shot toward the sun during the brighter, summer months. Adding something like a cheap Brand-X UV filter from Ritz Camera or some big camera store's junk bin can also help add some flare.
A number of really cheap zoom lenses in the 35mm-135mm range have 12 or 13 elements and tend to flare quite badly when shot toward the sun, but those are difficult to find in Canon EF mount.
One of the best ways to get a flarey, ghosting prone zoom is to go to a well-stocked but one-outlet camera store, a Mom and Pop operation, and ask if they have any old,cheap manual focus zoom lenses in Nikon mount. You then need a Nikon F to Canon EF lens mount adapter (look for one from FotoDiox in the USA, or on
eBay for the chrome plated,bras or bronze ones that cost about $17-$22 each). A Canon EOS crop-body will shoot almost ANY Nikon F mount lens with an adapter..look for old Rokinon or Cambron or Sears, any old junk zoom,especially the wide-to-tele ones like 35-70 or 35-105--late 70's cheapies that sell for $20 to $30 each.
Take one or two outside the store and shoot them toward the sun on a demo Nikon body. Mom and Pop camera stores often have BOXES of this junk someplace and ought to help you out if you tell them what you want. You'll get flares and ghosting galore if you buy a really badly designed 70's zoom!