Some Elemental bombs suggestions:

My basis:

Glob splatter: A Yellowish Blast Cube bomb that releases a blast and splatters Glob cluusters like the Blast Cube then explodes.

Starts at two star, 3* is Orange, 4* is red, 5* is Blue.

Number of globs:3= 2*, 4 =3*, 5 =4* and 6-5*

Second Basis:
5* Deconstructor bomb= Aniliattion Recycler: The line become Elemental. The bomb still holds its massive Construct bonus.

Third Basis:
3* Impact hammer: one orb rises from one end of the radius to the other vertically, the 'impact' of the orb will cause damage. the other orbs would go of horizontal. The orbs would cycle doing their animations until a blast of the two combined ends it.

4* Trauma Hammer: Stronger version

5*Devastator Piston: a faster, stronger version which Has two orbs going Vertical and two going horizontal.

Musicboom line: A elemental bomb that once released, creates a sound wave that does continius damage. It has its radius graphic wire frame, squiggly lines like soundwaves.

4=Deciboom, 5*Sonicboom Shatterer

Normal bomb

Bomb lobber: A glove that holds a bomb that can be thrown as its charge. It has a small radius and low damage, but can be thown repetidly, high CTR and a good range

A shadow bomb

Tython's Wrath: A bomb that releases a Skyburst which can freeze enemies.