First give him a personality. Have NPC's talk about him the way modern people do about celebrities - in fact have him do something, anything. Most campaign dieites are too static. Can anybody actuall name even one thing Pelor has done?
One thing I did in a past campaign was to have three small moons whose primary purpose was to eclipse only a small part of the sun. These could be used by the sun god to punish an area, or as a blessing to shade an army at the height of the day. Each of the moons was a goddess in her own right and all were wives of the primary sun god, so there was plenty of room for constant gossip. It kept the clergy busy.
One thing I did in a past campaign was to have three small moons whose primary purpose was to eclipse only a small part of the sun. These could be used by the sun god to punish an area, or as a blessing to shade an army at the height of the day. Each of the moons was a goddess in her own right and all were wives of the primary sun god, so there was plenty of room for constant gossip. It kept the clergy busy.