Looks great! Evokes "Thunderfox" moreso than "Thunderbird" but that appears to be the point, and it works well. I especially like how the round envelope fold i

Looks great! Evokes "Thunderfox" moreso than "Thunderbird" but that appears to be the point, and it works well. I especially like how the round envelope fold is contrasted with the background enough to be immediately recognizable as an envelope despite having a very non-envelope shape.