screen_icons is an icon making challenge based on using screen captures. More info and the rules can be found
here.
fluffityfluffexchange, an exchange centered around all kinds of fluff, has
opened sign-ups until March 18th, 12:01PM CDT. Nominations are still open too.
genfreeformexchange, a multi-fandom exchange focused on gen fanworks, with freeform tag matching, has
opened sign-ups until March 20th, 9:59PM EST.
sufficiently_advanced_ex, an exchange for scifi, fantasy, and horror literature, has
extended sign-ups until March 24th, 8PM Eastern.
storkswap, an exchange for fic and art focusing on pregnancy or babies under the age of one, has
opened sign-ups until March 26th, 10PM EDT.
no_true_pair has opened sign-ups for their
Four-Character Mini-Challenge, a challenge where you make a list of characters, a set of prompts is posted that uses all the characters in different combinations, and you create works using those characters.