PictureBox initial image - vb.net

Question

Is there a way that you can set all of the picboxes to a initial image when they are loaded? Such as: when you start a round, all the images are set to a image of a card facing down, then when the round starts it shows an image.
EDIT: How do I clear what is in the PicCard.Image?
Public Class Form1
Private Cards As New List(Of PictureBox)
Private randomnumber As Integer
Private HowManyCards As Integer
Private Sub SetupCards(numberofcards As Integer)
ClearGame()
For i As Integer = 0 To numberofcards
Dim PicCard As PictureBox = New PictureBox()
PicCard.Width = 100
PicCard.Height = 200
PicCard.Top = 50
PicCard.Left = 50 + PicCard.Width * i
Me.Controls.Add(PicCard)
PicCard.Image = imglistBackOfCard.Images(0)
Next i
End Sub
Private Sub ClearGame()
If Cards.Count > 0 Then
For i As Integer = 0 To Cards.Count - 1
Me.Controls.Remove(Cards(i))
Next
End If
' Clear the cards if they were already setup from a previous game.
Cards.Clear()
End Sub
Private Sub RandomCard()
Randomize()
randomnumber = Int(Rnd() * imglist1.Images.Count - 1) + 1
End Sub
Public Sub ShowCards(numberofcards As Integer)
For i As Integer = 0 To numberofcards
Dim PicCard As PictureBox = New PictureBox()
RandomCard()
PicCard.Width = 100
PicCard.Height = 200
PicCard.Top = 50
PicCard.Left = 50 + PicCard.Width * i
Me.Controls.Add(PicCard)
PicCard.Image = imglist1.Images(randomnumber)
PicCard.Tag = randomnumber
AddHandler PicCard.Click, AddressOf Me.cardflip_click
Cards.Add(PicCard)
Next i
End Sub
Private Sub StartGame_Click(sender As Object, e As EventArgs) Handles btnStartGame.Click
ShowCards(HowManyCards - 1)
End Sub
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
HowManyCards = InputBox("How Many Cards?", "Please Enter")
SetupCards(Int(howmanycards - 1))
End Sub
End Class