I have a few sites like colorlovers that I use for finding new color schemes. Though sometimes they aren’t enough.
You need to further develop your schemes and further elaborate on their base colors, that’s why I love hexcolorpedia.
Hexcolorpedia covers color conversion (Hex color to Rgb, Cmy, Cmyk, Hsl, HSB/HSV, XYZ, Yxy Hunter-Lab, and Grayscale) Tints, tones, shades. and color blending. Blending two color values to create a gradual transition. It also does Color Schemes, but in more detail & looks at complementary, analogous, triadic, tetradic, aesthetic, hue rotation, and monochromatic colors schemes.