The combination of sun and solstice dragons breed either another sun or solstice. However, the solstice dragon is a limited edition. It will most likely only be a breeding result while the solstice is available.
The five most common results of breeding chrome and flower dragons are:ForgeBrassFlowerPollenPoison
Storm
Results of current and tree dragons can be mud, crystal, or seaweed dragons.
probably a chrome
You get a plant dragon.
You get the scorch dragon
Blue fire
90% moss
Mud dragon!!
you get a poision dragon
it could be anything?
Some results of breeding river + thunder are:Solar EclipseSonicQuakeRiverGold Olympus