Hey All,
This is a theme generator for an old release of Bootstrap 3, before flat-design really took off. It allows you to generate cohesive palletes using 2-4 colors using your primary color as the "seed", and then preview the theme in Bootstrap. i really recommend the "c" colors from the final pallete, because the pastel coloring looks really nice.
i think that you could pretty easily generate a theme you like, then reference Android's 500 Colors to get the closest Material colors. Alternatively, you could put in a 500-Color as your seed and get a decent looking pallete right away.
For example "#8bc34a" would be the 500 Light Green as your primary, an aquamarine teal as your secondary, a tan as your tertiary and a soft lavendar as your accent.
Tony also recommended Adobe Kuler