Try to use colors that you have represented in your ministry.
It is best to keep a uniformed look, but you can deviate from that depending on the circumstance.
If you want to make
more of a impact statement use a darker background and lighter letters (fonts). Makes the letters really stand out.
a more subtle relaxed look use a lighter background and darker letters (fonts). A little warmer look, casual kind of feel.
There may be a situation where using different backgrounds maybe more appealing. Use your own discretion. Above
all have fun with it!