Raggamoffyns (Monsters of Faerun) can dominate a target, infesting it and granting it the Construct Type via the Captured One template, which has LA of 0.
This lets you qualify any race for the Incarnate Construct template. Because of spell targeting rules, after you turn them back into a fleshbag, you can remove the Raggamoffyn with no consequence. You now have a race with whatever your racial stat bonuses were before, whatever movement modes you had before, and basically nothing else- but you also have -2 LA.
So if you've always wanted a Half Water Elemental Lesser Planetouched Sharin, now you can have it!
Type: Humanoid (Aquatic, Planetouched, Water)
Stat Bonuses: +6 Strength, +4 Dex, +2 Int, +2 Wis, +2 Con, +2 Cha
Natural Armor: +1
Speed: 30 ft land, 40 ft swim
Immunities: Disease, [Water] effects.
Spell-Like Abilities: 1/day (HD): Obscuring Mist (1), Fog Cloud (3), Water Breathing (5), Control Water (7), Ice Storm (9), Cone of Cold (11), Acid Fog (13), Horrid Wilting (15), Elemental Swarm (17), Plane Shift (19)
If you want to give your DM an Aneurysm, there's nothing preventing you from re-applying the Raggamoffyn to the target, turning them BACK into a construct, then casting Incarnate Construct on them again, to give them another -2 LA and letting you basically apply all the templates ever.