Ok so I had a few suggestions on what to do with extra sparks:
Fire entity: (Works only if there is a fire in room) "Your entity crushes some
sparks and enhances the fire" would work like heatstick giving +1-2 or
something to the fire
Air entity: (Works only if there is water in the room) "Your entity crushes
some sparks and dries the room of water" -> removes water from room for a
while, like drying wind but not a field
Water entity: Well, same as above but creates water into room.
Earth entity: (Would work in outdoors room only) "Your entity crushes some
sparks and creates an edible potato" Or any edible nonherb consumable, since
newbie rifts dont get create food or satiate

Spark amount could vary depending on level. At least some level of satiating
method would be useful for those newbie rifts that are not in mage guild (and
you get create food from level 5 onwards anyway)