Fuuton and Suiton = Hyoton. creates ice mirrors similar to haku's. the ice can materialize like Jukai does for moukton.
Katon and Doton = Yoton. creates an area of lava with the same range as jukai. and does continuous damage like chidori sword if you stay in contact with it.
Katon and Suiton = Futton(Boil Release like mizukage). creates an area of vapour with the same range as jukai. and does continuous damage like chidori sword if you stay in contact with it.
Raiton and Doton = Bakuton. explosive chakra release like deidara or gari. this would fire explosive projectiles. exploding palm justsu.
deidara clan would have this. for deidara clan you could just have from C1 to C3 clay bombs and a huge C4 clay bomb like kirin.
he can also have clay clones. maybe and awakened clay secret or something. just spitballing here. he could also have explosive clay minions. and a clay bird summoning.
There's also magnetic release. Fuuton and Doton = Jiton. not many ideas on this one.