Idea #1: Give away a product that your company sells. (Example)
Idea #2: Give away a bundle of themed products. (Example)
Idea #3: Give away a custom version of your product. (Example)
Idea #4: Give away a holiday themed prize.
Idea #5: Give away a discount code to people enter. (Example)
Idea #6: Give away a gift card.
Idea #7: Give away big prizes to promote company events/milestones.
Idea #7: Give away a small (low cost) prize every week. (Example)
Idea #8: Give away a service that you provide.
Idea #9: Offer free content downloads, videos & resources to people who register to win.
Idea #10: Combine a sweepstakes with a webinar or other content.