I think everyone is in agreement that the jewels/modes shouldn't be collected via a wish. I'd liked to see more specific ideas for modes or other game features.
For example, I really like the cyclops MB idea listed above, was thinking something similar myself. My idea for that jewel/mode was to have a 2 ball MB in which you battle the cyclops (similar to the villains in Xmen); you'd collect stones by shooting the ramp and then have to throw the stones at the cyclops by hitting either captive ball. You'd have to make a certain amount of shots to both captive balls to complete the mode. You'd have a health meter that is based on a timer and the cyclops would have one that is diminished based on orb shots. You could collect more time via the pop bumpers or something like that. Once you time out the flippers go dead, you either beat the mode or you have to start all over.
You guys could also list more basic ideas as well. For example, how about spinning the lamp 15 times to lit modes at the genie? Then you have to make a ramp shot (collecting a fire ball) and shot the genie to start a mode within "x" amount of time. Then while the genie is holding the ball you can select which mode you want to play using the flipper buttons.