Creates gmail-app like icons, very limited ... get the font from google fonts.

app.py

from PIL import Image, ImageDraw, ImageFont
import string
import math

# colours from www.flatuicolors.com
COLOURS = dict(turquoise="#1abc9c",
    emerald="#2ecc71",
    peterRiver="#3498db",
    amethyst="#9b59b6",
    wetAsphalt="#34495e",
    greenSea="#16a085",
    nephritis="#27ae60",
    belizeHole="#2980b9",
    wisteria="#8e44ad",
    midnightBlue="#2c3e50",
    sunFlower="#f1c40f",
    carrot="#e67e22",
    alizarin="#e74c3c",
    clouds="#ecf0f1",
    concrete="#95a5a6",
    orange="#f39c12",
    pumpkin="#d35400",
    pomegranite="#c0392b",
    silver="#bdc3c7",
    asbestos="#7f8c8d")

W, H = (256, 256)

text = "A"

color_index = int(math.floor(string.uppercase.index(text) / 1.3))
colour = COLOURS.items()[color_index][1]


image = Image.new("RGBA", (W,H), colour)
font = ImageFont.truetype("Roboto-Light.ttf", int(H / 1.05))
draw = ImageDraw.Draw(image)
w, h = draw.textsize(text, font)
draw = draw.text(((W-w)/2,(H-h)/2), text,("white"), font=font)

image.save("test.png")