Themes for Sony Ericsson phones for a screen resolution 240x320 pixels - created for the Sony Ericsson j20i (Hazel), but it should work without problems on SE Elm, SE Yari, SE Zylo.
As for the other to the SE of such a resolution, it is possible that the themes will require a match.
(Theme preview is taken from Sony Ericsson Themes Creator, on phone it looks better ;) )
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Haunted House  5.00 (2)	Grass  4.67 (3)	Leaves  5.00 (1)	Imagination  4.00 (1)
Sax And Rose  0.00 (0)	Gray Dots  0.00 (0)	Violin  0.00 (0)	Red Flower  0.00 (0)
Scary Pumpkin  0.00 (0)	Green Alien  0.00 (0)	By The Moon  0.00 (0)	Spider Web  0.00 (0)