Sources I use for https://rainbowfic.tumblr.com/:

https://randomitemdrop.tumblr.com/
~~https://pettyprompts.tumblr.com/~~
~~https://www.tumblr.com/have-a-story-prompt~~
https://zazuprompts.tumblr.com/ (monthly prompt lists)
~~https://www.tumblr.com/youneedsomeprompts~~
~~https://dailystoryprompts.tumblr.com/~~
https://www.tumblr.com/promptsforthestrugglingauthor
~~https://givethispromptatry.tumblr.com/~~
https://soprompt.tumblr.com/
~~https://writing-ideas-inc.tumblr.com/~~
~~https://nightprompts.tumblr.com/~~
https://promptlyprompting.tumblr.com/
~~https://www.tumblr.com/dark-fiction-and-angst~~
~~https://www.tumblr.com/ghostly-prompts~~
~~https://here-haveaprompt.tumblr.com/~~
~~https://quick-otp-prompts.tumblr.com/~~
~~https://writinghoursopen.tumblr.com/~~
~~https://a-u-prompts.tumblr.com/~~
https://www.tumblr.com/promptsblog
~~https://randomstoryprompts.tumblr.com/~~
~~https://promptsforyourwhumpfic.tumblr.com/~~
https://www.tumblr.com/writing-challenges-and-prompts
https://www.tumblr.com/dailystoryelements
~~https://1prompteveryday.tumblr.com/~~

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