Unique and Fun builds for 3.5

[ExLibrisMortis]

• Bardsader/bardblade
• Swift hunter (melee or ranged)
• Unseen Seer sorcerer or wizard (scout base or rogue base)
• Crusader/incarnate (maybe with monk for Decisive Strike)
• Wild shape ranger/master of many forms
• Astral deva or trumpet archon (monster class)
• Psychic warrior (with or without Tashalatora)
• Moon-warded fangshields ranger 4/paladin 2/ranger knight of furyondy X with Serenity, Devoted Tracker (übermount/Wis-SAD), requires non-humanoid base (e.g. elan, aasimar, anthropomorphic animal)
• Anthropomorphic tiger into Bloodclaw Master
• One-level-of-everything into Champion of Gwynharwyf (e.g. barbarian 1, hit-and-run fighter 1, battle dancer 1, Wild Shape ranger 1, mariner 1, crusader or warblade 1 at level 5, Anointed Knight at 6 if you can squeeze it in and have the Cha to get the DR and stack it with CoG)
• The above, but with Singh Rager (Lawful barbarian)
• Psion or erudite or ardent into Constructor
• Horselord barbarian crafty hunter barbarian (Dragon 338 + UA ACFs)
• Sorcadin (really more for ECL 10+, but you can start early)
• Suel Arcanamach 3/Abjurant Champion 5 (as above, but you can start with crusader or warblade 5 and the casting bolts on easily)
• Straight shaman
• SA fighter 1/paladin into Shadowbane Inquisitor--start planning your fall into Blackguard now, fall at level 12 or so
• Magical Training cleric 4/church inquisitor 1/paragnostic apostle 1 into Dweomerkeeper, focus on Divine Defiance (counterspelling) to keep the power relatively modest. Focus Domain (Inquisition), Improved Domain (magic), grab a nice staff.

A bunch of these get started at level 6-7 (e.g. the first level in many PrCs would be the 6th), but that's the design of the game, pretty much.