Coloring in shapes?

[ParaChase]

I have a set of shapes created in visual basic that need to be colored in:

Public Class Form1
 
    Private Sub btnDraw_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDraw.Click
        Dim formSurface As Graphics = Me.CreateGraphics 'creates surface
 
        Dim world As New Pen(Color.Black, 3)
        formSurface.DrawRectangle(world, 250, 50, 300, 300) 'world
 
 
        Dim roof As New Pen(Color.Black, 3)
        Dim roof1 As New Point(325, 200)
        Dim roof2 As New Point(475, 200)
        Dim roof3 As New Point(400, 100)
        Dim roof4 As New Point(400, 100)
        Dim curvePoints As Point() = {roof1, roof2, roof3, roof4}
        formSurface.DrawPolygon(roof, curvePoints) 'triangle roof
 
        Dim body As New Pen(Color.Black, 3)
        formSurface.DrawRectangle(body, 325, 200, 150, 150) 'square body
 
        Dim sun As New Pen(Color.Black, 3)
        formSurface.DrawEllipse(sun, 450, 75, 50, 50) 'sun
 
        Dim door As New Pen(Color.Black, 3)
        formSurface.DrawRectangle(door, 387, 300, 25, 50) 'door
 
    End Sub
End Class

Everything works perfectly; the shapes are all generated where I want them to be. (I'm trying to draw a house) However, how do I color them in? Also, if I do, will the colors overlap (I want that to happen)?

Should I use some function like image.fill? I know that isn't right but I'm looking for something like that.

Thanks!