Need for Alien ship sprite

[magneto]

Hi,
I am making a Alien shoot em up game and it is multi-level game.
I have finished level 3 and working on level 4. I ran out of Alien ship sprites. With each level I present 3 types of animated Alien assault ships and one Alien Mother ship.

Can someone please direct me as to where I can find more sprites.

Thanks in advance

Regards,

Magneto

[DST]

Horizontal or Vertical?

[NevenResnik]

I can make some if you'd like.

[magneto]

Thanks for Reply everyone.
The sprites are bird's eye view and they are vertical with solid black background. The move down from the top of screen.
Please take look at sample that I made for my game. These are 2d images and I have used Paint.net to make some 2d animation. I could not do that for the Mother ship. For their animation I just change their color.

Regards,

Magneto