Real Techniques Stippling Brush - for liquid foundation. Gives light to medium coverage with an even airbrushed look. My favourite way to apply foundation. Plus Real Techniques brushes are well priced for the quality and have very soft synthetic fibres with no shedding.
Real Techniques - Stippling Brush (Original Version) is good for a lighter finish of liquid foundation, bb cream, and/or tinted moisturizer. Even though I prefer powder blush, this brush probably would work with cream blush application as well.