[3.5] Adding energy descriptors to spells

[jiriku]

Is there any way to add an an energy descriptor to a spell that doesn't have one, apart from using the snowcasting feat?

[PairO'Dice Lost]

If they deal energy damage there's always Energy Substitution, Energy Admixture, or Born of the Three Thunders, but those are the only other feats I remember offhand.