If it clear to the dog what part of the jump they need to take, how the wings look should not be that big a deal to them. Haute Dawgs has the eeriest looking black cat jump. These cats look evil.
Creative jumps are wonderful and add to the spectator appeal.
Here's a nifty idea for practice jumps. Then drill holes for the 4 different jump heights into each pole. Stick carriage bolts in the holes, set a striped pole on the bolts and voila, you have a practice jump. When you choose to use them as weave poles, the dogs never seem to notice the holes. If you have any left over, they can do triple duty as tunnel stabilizers.