iMessage flat redesign

Been using the iMessage client for almost a year now, really liking the service itself but I think the mac application isn't that nice. So here's a simple redesign, it's not how apple would do it but I like it. Make sure to check out the attachment.

Tell me what you think about it.

Ps.

Used avatars from @Maarten Dijk , @Alex Vanderzon , @Beau Hankins , @Kevin Granger , @Floris Jansen , @Daniel Fass and @Haziq Mir
Hope they don't mind. ;)