Some maps I found interesting.
koth_tomb: Egyptian-style map.
http://www.tfmaps.com/details.php?file=1028
pl_borneo: Tropical Rainforest map.
http://www.tfmaps.com/details.php?file=1026
koth_thunder: Small King of the Hill map with many routes to the point. http://www.tfmaps.com/details.php?file=978
ctf_outset: Tropical map based on a Legend of Zelda map.
http://www.tfmaps.com/details.php?file=54
murderball_2011_rc3: http://www.tfmaps.com/details.php?file=448
dm_sonic_vs_shadow: Sonic Adventure 2 map.
http://www.tfmaps.com/details.php?file=884
coop_negawisp: Sonic Colors final boss map.
http://forums.tf2maps.net/downloads.php?do=file&id=5021
ktf_innercity_b3: City map with special gamemode called King of the Flag. http://www.tfmaps.com/details.php?file=66
koth_twisted: Futuristic Space map.
http://www.tfmaps.com/details.php?file=40
koth_cow_a1k:A map with LOTS of cows. Need I say more? http://forums.tf2maps.net/downloads.php?do=file&id=5353
cp_silo_c-a10: Based on a Half-Life map.
http://www.tfmaps.com/details.php?file=74
cp_italy: Based on a CS map.
http://www.tfmaps.com/details.php?file=527
cp_toy_fort_alt3: http://www.tfmaps.com/details.php?file=707
cp_lost: A maze. http://www.tfmaps.com/details.php?file=145
Mad Monster Mansion: A crazy mansion with halloween boss fights. http://www.tfmaps.com/details.php?file=876
cow_dustbowl_a1: http://forums.tf2maps.net/downloads.php?do=file&id=5017