Anyways, Here are some ability ideas and what they would look like.
Sand-Minions: Summon a humanoid fighter made of sand, to fight alongside you. I imagine these guys would be decent, but fairly weak at the same time. They would look like people made of sand, with a light-sand cloud around them, [imitating the idea of sand-grains falling off them.
Sand-wave: There would be different levels, the higher level, the more damage, speed, and size it has. I basic wave of sand rushes towards where you point.
Sand Tsunami: Much larger and much wider version of the Sand Wave.
Sand-vines: Vines made of sand Shoot from the ground, [ preventing any enemy or person from moving for a short period of time and damaging them slightly].
Dissipate: Your character dissipates into a cloud of sand for a short period of time, and you basically become ethereal [being immune to damage during that time period, but being unable to attack during then as well] You'd still be able to move, i'd imagine.
Sand-storm: Summon a storm of sand to flutter around a vicinity, dealing damage to anyone in its range and slowing them [damaging their speed, as long as their in the range] their speed would return after leaving the spell's area of affect.
Sand-spikes: You summon a quick burst of spikes from the ground where ever you aim, dealing a tremendous damage.
Sand Arena: Summon a large wall then encases anyone or thing within a small vicinity. [helps keep back enemy's if you are being jumped by many and when you just want to focus one only].
Sand-shield: Creates a barrier roughly the size your body that will stop both magical and physical damage. the shield will stay until your magicka is completely drained. [you cannot attack when shield is activated]
Sand weapons: summon a weapon of choice, made of sand. They break easily but do hefty damage.
Sand Skin: It drains only a little amount of Magicka when in use, but is permanent, until you run out of magicka or it breaks. [this would be the master protection spell], a certain amount of damage done to it breaks it, but it can take loads of damage, as long as it is activated, you'd be invulnerable to physical damage. However, magic, as a drawback, is strongly-effective against it.
Plenty more ideas, but I am curious if these spells are even possible and or if anybody is interested in making them or even likes the idea.
I wouldn't know where to begin, eventually I'll get to learning scripting and all of that, however, I currently am working on mastering texturing and 3d modelling. that's my skills.