Matte Gradient.

Gradient: Catrice - 240 Sold Out Forever & 740 King of Greens,
Matte topcoat (shown) Chanel - Le Top Coat Velvet

Complementary, my dear Watson.

Okay, I'm semi-sorrry for this post title.
Anyway, a good complementary contrast always stands out so I wanted to apply that in a nice sponge gradient mani.

Polishes used:
2true, 'Shade no. 25' (orange)
2true, 'Shade no. 15' (blue)
Essence, '01 - Wonderlicious Green' (it's blue, damnit)
Golden Rose, 'Scale Effect 12' (flakies)

2true's shade of blue works very poorly as a polish on itself, so I layered it over the ever misnamed Wonderlicious Green, to have a good blue base. The 2true blue is a very sparkly polish, and so is its orange, so those work together very well. The orange is pretty well pigmented, and though a bit coppery now, is really a very bright orange when used on its own.

And finally, I feel the largely orange flakies tie the whole together quite nicely

Flash Gradient.

No Queensday nail art from me, I'm afraid! I'm not a great big fan of orange, and since I'll be away from home for tomorrow I don't want to be stuck with such a specific type of nail art.

Okay! I wanted to do something cool again. I love the complimentary contrast of green-purple, and these two are from Hema's Neon set (74 - purple, 75 - green). Though as somebody told me when I wore these colours once before "you can make even neon look dark".
I have only one gradient under my belt prior to this one (of which I sadly have no good pictures) so that's not much experience in the area. I didn't know if I was going to manage to blend these two very different shades well enough for my liking. Of course, it's not a perfect gradient - but I still think it looks pretty nice.

Lightning bolts are a gradient variation on this tutorial from Nailside.
Black is 'Black!' from Koh.

Picture taken out of direct sunlight.