1) These are really funny. 2) I really like how it looks with the different fonts, colors, and graphics. Also, I like how each rectangle is separated but it's not the same all the way through.
SmallWorld: 100 Not-Boring Writing Prompts for Middle- and High Schoolers
100 Personal Essay Topics. This list has some really good prompts! http://www.neindiaresearch.org/top-100-interesting-personal-essay-topic-ideas
20 Journaling Prompts to Help You Know and Accept Yourself
Fantastic Tumblr page full of nothing but excellent writing prompts.
30 Day Writing Challenge. Would revise some of the prompts to use in high school but looks like a fun idea.
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This is a great list!! Could be good for most ages! SmallWorld: 100 Not-Boring Writing Prompts for Middle- and High Schoolers
persuasive writing prompts by Meri Pera More
10 Tips for Writing an Essay