plotting - Styling individual bars in a BarChart with grouped data

Consider the following:

fakedata = RandomReal[{4, 9}, {5, 10}];
BarChart[fakedata, BarSpacing -> {0, 0.4}, 
 ChartBaseStyle -> EdgeForm[], 
 ChartStyle -> {{Magenta, Blue, Red, Orange, Green}, Opacity[#] & /@ Range[0.1, 1, 0.1]}]

This is all well and good, but what I really want is the following, but grouped, so that the bars are opaque, the ticks come out how I want them, and the little space in between the groups (from the BarSpacing option) shows up:

BarChart[Flatten@fakedata, BarSpacing -> {0, 0.4}, 
 ChartBaseStyle -> EdgeForm[], 
 ChartStyle -> 
  Flatten@Outer[Blend[{{0, White}, {0.7, #1}, {1.1, Black}}, #2] &, {Magenta, 
     Blue, Red, Orange, Green}, Range[0.1, 1, 0.1]]]

Unfortunately if I create a "matrix" of colours as the value of the ChartStyle option, only the second list is picked up, and I get this:

BarChart[fakedata, BarSpacing -> {0, 0.4}, 

 ChartBaseStyle -> EdgeForm[], 
 ChartStyle -> Outer[Blend[{{0, White}, {0.7, #1}, {1.1, Black}}, #2] &, {Magenta, 
    Blue, Red, Orange, Green}, Range[0.1, 1, 0.1]]]

How can I style my bars individually like in the second example, when the data are grouped?

Answer

 fakedata = RandomReal[{4, 9}, {5, 10}];
 styles = Outer[Blend[{{0, White}, {0.7, #1}, {1.1, Black}}, #2] &, {Magenta, Blue,
 Red, Orange, Green}, Range[0.1, 1, 0.1]];

 BarChart[MapThread[Style, {fakedata, styles}, 2] (*thanks: Verbeia & Mr.Wizard *),
 BarSpacing -> {0, 0.4}, ChartBaseStyle -> EdgeForm[]]

Alternatively, one replace MapThread[...] by :

 Partition[Inner[Style, Flatten@fakedata, Flatten@styles, List], 10] (* thanks: VLC *)
 (* or *)
 ArrayReshape[Inner[Style, Flatten@fakedata, Flatten@styles, List], {5, 10}] (* Version  9 *)

Update: Using ChartElementFunction

 cedFX[{{xmin_, xmax_}, {ymin_, ymax_}}, ___] := {Dynamic@
   Blend[{{0, White}, {0.7, CurrentValue["Color"]}, {1.1, Black}}, 
   ((1/10) Mod[xmin - .4 Quotient[xmin, 10], 10])],
   Rectangle[{xmin, ymin}, {xmax, ymax}]}; 
  BarChart[fakedata, BarSpacing -> {0, 0.4}, ChartBaseStyle -> EdgeForm[],
  ChartElementFunction -> cedFX,
  ChartStyle -> {{Magenta, Blue, Red, Orange, Green}, None}]

(Note: needs better tuning of the blending parameter as a function of xmin,xmax and the value of the BarSpacing option)