I'm late to the party, but I've ran several giveaways for Rollin.io (until the site closed 5 years ago). See my overview for inspiration:
Campaigns
1. June 2016 - May 2017: Rollin.io Lottery Tickets Daily Giveaway (previous thread)
2. December 2016 - January 2017: Rollin New Year Lottery | $500* Giveaway
3. December 2016 - January 2017: Rollin New Year Contests | $2000* Giveaway
4. February 2017: Rollin Bet ID Prediction | $200 Giveaway
5. March 2017: Rollin Bet ID Prediction | $250 Giveaway
6. April 2017: MAY THE FOURS BE WITH YOU | $250 Rollin Giveaway
7. May 2017: JOIN THE 1% | $300* Rollin Giveaway Contest
8. June 2017: Two the Moon! | $350* Giveaway Contest
9. July 2017: Money Grows on Threes! | $375* Giveaway Contest
10. August 2017: Daily Quest! | $500* Giveaway Contest
Organizing those giveaways was always a lot of fun. I got carried away coming up with the topic titles 1. June 2016 - May 2017: Rollin.io Lottery Tickets Daily Giveaway (previous thread)
2. December 2016 - January 2017: Rollin New Year Lottery | $500* Giveaway
3. December 2016 - January 2017: Rollin New Year Contests | $2000* Giveaway
4. February 2017: Rollin Bet ID Prediction | $200 Giveaway
5. March 2017: Rollin Bet ID Prediction | $250 Giveaway
6. April 2017: MAY THE FOURS BE WITH YOU | $250 Rollin Giveaway
7. May 2017: JOIN THE 1% | $300* Rollin Giveaway Contest
8. June 2017: Two the Moon! | $350* Giveaway Contest
9. July 2017: Money Grows on Threes! | $375* Giveaway Contest
10. August 2017: Daily Quest! | $500* Giveaway Contest