Take the High Ground has a photo tutorial on making some impressive looking smoke markers.
gaming aids
Making Explosion Markers
Here’s a tutorial on making explosion markers.
Magic Set Editor Software
Here’s a bit of free software that helps you create magic style cards. I use the software to create unit cards for my miniatures games. They’re much better, both practically, and visually, than having unit sheets lying all over the table.
Smoke and Flames Markers For Flames of War
Big Lee has some instructions on making smoke and flames markers for Flames of War
Flames Of War Bombardment Markers
Shadowkings has a set of downloadable bombardment markers for Flames of War.