It's relatively easy to add an Image Command Field to a GridView programmatically. Here's how:

// in C#

if (!Page.IsPostBack)
{
    CommandField field = new CommandField();
    field.ButtonType = ButtonType.Image;
    field.SelectImageUrl = "~/Images/MyPic.GIF"; //Specify image URL
    field.ShowSelectButton = true;
    field.HeaderText = "Select";
    GridView1.Columns.Add(field);
    GridView1.DataBind();
}

' in VB.NET

If (Not Page.IsPostBack) Then
    Dim field As New CommandField()
    field.ButtonType = ButtonType.Image
    field.SelectImageUrl = "~/Images/MyPic.GIF" //Specify image URL
    field.ShowSelectButton = True
    field.HeaderText = "Select"
    GridView1.Columns.Add(field)
    GridView1.DataBind()
End If