This is the base of a minecraft skin stealer. You will beable to add a bunch of stuff to this to make it more user-friendly and turn it into a nice little program.
Requirements
1 Button
1 Textbox
1 PictureBox
The rest is up to you.
[vb]Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
PictureBox1.ImageLocation = "http://s3.amazonaws.com/MinecraftSkins/" + TextBox1.Text + ".png"
End Sub
End Class[/vb]