Developed to simulate the little bit of randomness which exists when you hand make things and place them in the real world this tool simply shakes things up a little bit.  Simply this rhinoscript uses a random function to produced minor variations in Position (move), Orientation (rotation), and Dimension (scale) within a range specified by the user.

Rhino Script

Option Explicit
'Script written by <David Mans>
'Script copyrighted by <NeoArchaic Studio>
'Script version Tuesday, January 19, 2010 11:41:24 PM

Call Main()
Sub Main()
	Dim arrInputs, arrTemp, intCount, arrSorting(), arrGroups
	arrTemp = Rhino.GetObjects("Select Objects to Tile",, True)
	If isNull(arrTemp) Then Exit Sub
	
	arrGroups = SelectedGroups(arrTemp)
	
	intCount = uBound(arrGroups)
	ReDim arrSorting(intCount)
		
	arrInputs = Rhino.PropertyListBox(array("Rotation Min", "Rotation Max", "Move", "Scale% Min", "Scale% Max"), array(0, 360, 0, 100, 100), "Jitter")
	If isnull(arrinputs) Then Exit Sub
	
	Dim i, cnPt
	Call Rhino.EnableRedraw(False)
	For i = 0 To intCount Step 1
		arrSorting(i) = Rhino.ObjectsByGroup(arrGroups(i))
		
		cnPt = boundingBoxCenterPoint(arrSorting(i))
		Call Rhino.ScaleObjects(arrSorting(i), cnPt, array(random(arrInputs(3) * 0.01, arrInputs(4) * 0.01), random(arrInputs(3) * 0.01, arrInputs(4) * 0.01), random(arrInputs(3) * 0.01, arrInputs(4) * 0.01)), False)
		Call Rhino.RotateObjects(arrSorting(i), cnPt, random(arrInputs(0), arrInputs(1)), Rhino.WorldXYPlane()(1), False)
		Call Rhino.RotateObjects(arrSorting(i), cnPt, random(arrInputs(0), arrInputs(1)), Rhino.WorldXYPlane()(2), False)
		Call Rhino.RotateObjects(arrSorting(i), cnPt, random(arrInputs(0), arrInputs(1)), Rhino.WorldXYPlane()(3), False)
		Call Rhino.MoveObjects(arrSorting(i), cnPt, array(cnPt(0) + random(-1 * arrInputs(2), arrInputs(2)), cnPt(1) + random(-1 * arrInputs(2), arrInputs(2)), cnPt(2) + random(-1 * arrInputs(2), arrInputs(2))))
	Next
	Call Rhino.EnableRedraw(True)
	
End Sub
Function SelectedGroups(arrObjects)
	SelectedGroups = Null 
	
	Dim arrGroups(), strGroup
	Dim i, nCount, bAppend

	nCount = -1
	
	For i = 0 To UBound(arrObjects)
		bAppend = False
		strGroup = Rhino.ObjectTopGroup(arrObjects(i))
		If Not IsNull(strGroup) Then
			If (nCount = -1) Then 
				bAppend = True
			ElseIf (FindGroup(strGroup, arrGroups) = -1) Then
				bAppend = True
			End If
			If bAppend = True Then
				nCount = nCount + 1
				ReDim Preserve arrGroups(nCount)
				arrGroups(nCount) = strGroup
			End If
		End If
	Next
	
	If (nCount > -1) Then SelectedGroups = arrGroups
	
End Function
Function FindGroup(strGroup, arrGroups)
	Dim i
	FindGroup = -1
	For i = 0 To UBound(arrGroups)
		If (StrComp(strGroup, arrGroups(i), 1) = 0) Then
			FindGroup = i
			Exit Function
		End If
	Next
End Function
Function boundingBoxCenterPoint(arrInputs)
	boundingBoxCenterPoint = Null
	Dim b,arrPt
	b = Rhino.BoundingBox(arrInputs)
	
	arrPt = array(b(0)(0) + (b(1)(0) - b(0)(0)) * 0.5, b(0)(1) + (b(3)(1) - b(0)(1)) * 0.5, b(0)(2) + (b(4)(2) - b(0)(2)) * 0.5)
	boundingBoxCenterPoint = arrPt
End Function
Function random(min, max)
	random = Null
	Dim dblValue: dblValue = min + (max - min) * rnd()
	random = dblValue
End Function