I drew this team fortress 2 art, game sprays myself for you the public to use for free.
I sketched this image with Opencanvas 4.5e plus and it took me approximately 2 hours to draw from a scanned image.

How to install your Team Fortress 2 game sprays into steam game files:
Save the Image below
Copy and Paste the image in C:\Program Files\Steam\steamapps\USERNAME\team fortress 2\tf\materials\VGUI\logos\UI

Load Team Fortress 2 and play a ONLINE server not a local, and it should work (dont forget to bind spray image key)

You can get VGUI and UI from Counter Strike: Source game files, but if you do not have Counter strike then you can create the folders yourself.

Team Fortress 2 - TF2 Spy Spray