Brushes will only show the current foreground color when you use them.  In order to create the effects you're looking for you need to use a color close to what you want and then use the filters to enhance the layer.  Brushes as best applied to a blank layer over the background for just this reason.  Otherwise, you end up using the filter on the entire image and not just the brush.

PS has a great collection of native filters.  You can use these to create the neon, glow, sparkle effects you're looking for.

Hugz from Phoenix, USA

Victoria

Remember, sometimes the dragon wins. Correction: MOST times.