doujinshi
Doujinshi are fan-published comics created in homage of a series. Most doujinshi artists create stories that place the characters in alternate worlds or situations -- be it a serious, gag, or sexual situation. These doujinshi are not created by CLAMP, even though some of the art does resemble theirs so closely.
Normal Pairing Doujinshi
Title: The Afterimage of a Blessing
Circle: Patisserie
Size/Pages: B5
Title: Captain Tsubasa
Circle: Alias Geek
Size/Pages: B5
Title: Distant Day of Song
Circle: COLOR
Size/Pages: B5, 36 pages
Title: Wing
Circle: COLOR
Size/Pages: B5, 50 pages
Notes: Combined TRC and xxxHolic doujinshi.
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Title: Omoi
Circle: Purin
Date: 2003-12-29
Size/Pages: B5, 24 pages
Notes: Combined TRC and xxxHolic doujinshi.
Title: Brand New Heart
Circle: Patisserie
Date: 2004-12-29
Size/Pages: B5, 34 pages
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Title: Funeral of Weathering
Circle: Caramel Mama
Date: 2004-12-30
Size/Pages: B5, 44 pages
Notes: Combined CCS and TRC doujinshi
Genre: Serious/Drama
Title: Fragile 
Circle: Little Crown
Date: 2004-03-21
Size/Pages: A5, 44 pages
Title: Go! Go! Circle: Little Crown
Date: 2005-08-12
Size/Pages: A5, 28 pages
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Title: Fake?
Circle: Patisserie
Date: 2005-12-29
Size/Pages: B5, 26 pages
Boylove Pairing Doujinshi
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Title: Milky Blue
Circle: Kaori Hatsuyama
Date: 2005-11-26
Size/Pages: B5, 18 pages
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Title: Secret Love
Circle:
Date:
Size/Pages: B5, 18 pages
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Title: Anata koi shiteru
Circle: mcbee
Date: 2005-03-27
Size/Pages: B5, 16 pages
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Title: Cute Father
Circle: Kaori Hatsuyama
Date: 2003-03-19
Size/Pages: B5, 30 pages
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Title: Warudakumi
Circle: Rivet
Date:
Size/Pages: B5, 40 pages
Credits: dark_persian, evercool, sugahcat