[Dgrimes]

Here is a beta scaling, that bounces back to its original size.

RDX.RegisterFeature({
    name = "animation_scale"; version = 1;
    title = i18n("Animation: Scale"); category = i18n("Animations");
    multiple = true;
    IsPossible = function(state)
        if not state:Slot("UnitFrame") then return nil; end
        if not state:Slot("Base") then return nil; end
        return true;
    end;
    ExposeFeature = function(desc, state, errs)
        if not desc then VFL.AddError(errs, i18n("No Descriptor.")); return nil; end
        if not (desc.owner) or (not state:Slot("Tex_" .. desc.owner)) then
            VFL.AddError(errs, i18n("Invalid texture")); return nil;
        end        
        return true;
    end;
    ApplyFeature = function(desc, state)
        local fname = "frame.Tex_" .. desc.owner;
        local createCode =
fname .. [[_animation = ]] .. fname .. [[:CreateAnimationGroup(); 
]] .. fname .. [[_animation:SetLooping("BOUNCE");
]] .. fname .. [[_rotation = ]] .. fname .. [[_animation:CreateAnimation("SCALE"); 
]] .. fname .. [[_rotation:SetScale(]] .. desc.xscale .. [[, ]] .. desc.yscale .. [[); 
]] .. fname .. [[_rotation:SetDuration(]] .. desc.duration .. [[);
]] .. fname .. [[_rotation:SetOrigin(']] .. desc.origin .. [[', 0, 0); 
]] .. fname .. [[_animation:Play();
]];
        local paintCode = [[
if not ]] .. fname .. [[_animation:IsPlaying() then ]] .. fname .. [[_animation:Play(); else return; end
]];
        state:Attach(state:Slot("EmitPaint"), true, function(code) code:AppendCode(paintCode); end);
        state:Attach(state:Slot("EmitCreate"), true, function(code) code:AppendCode(createCode); end);
    end;
    UIFromDescriptor = function(desc, parent, state)
        local ui = VFLUI.CompoundFrame:new(parent);
        
        local owner = RDXUI.MakeSlotSelectorDropdown(ui, i18n("Target texture"), state, "Tex_", nil);
        if desc and desc.owner then owner:SetSelection(desc.owner); end

        local duration = VFLUI.LabeledEdit:new(ui, 50);
        duration:SetText(i18n("Duration"));
        duration:Show();
        if desc and desc.duration then duration.editBox:SetText(desc.duration); end
        ui:InsertFrame(duration);
        
        local xscale = VFLUI.LabeledEdit:new(ui, 50);
        xscale:SetText(i18n("X Scale"));
        xscale:Show();
        if desc and desc.xscale then xscale.editBox:SetText(desc.xscale); end
        ui:InsertFrame(xscale);
        
        local yscale = VFLUI.LabeledEdit:new(ui, 50);
        yscale:SetText(i18n("Y Scale"));
        yscale:Show();
        if desc and desc.yscale then yscale.editBox:SetText(desc.yscale); end
        ui:InsertFrame(yscale);
        
        --Origin
        local er = RDXUI.EmbedRight(ui, i18n("Origin"));
        local origin = VFLUI.Dropdown:new(er, RDXUI.AnchorPointSelectionFunc);
        origin:SetWidth(100); origin:Show(); origin:SetSelection("CENTER");
        if desc and desc.origin then origin:SetSelection(desc.origin); end
        er:EmbedChild(origin); er:Show();
        ui:InsertFrame(er);
        
        --local edy = VFLUI.LabeledEdit:new(ctr, 75); edy:SetText(i18n("Offset X/Y:")); edy:Show();
        --local edx = VFLUI.Edit:new(edy); edx:Show();
        --edx:SetHeight(24); edx:SetWidth(75); edx:SetPoint("RIGHT", edy.editBox, "LEFT");
        --edy.Destroy = VFL.hook(function() edx:Destroy(); end, edy.Destroy);
        --ui:InsertFrame(edy);
        
        function ui:GetDescriptor()
            return {
                feature = "animation_scale"; version = 1;
                name = "Scale";
                owner = owner:GetSelection();
                duration = duration.editBox:GetText();
                xscale = xscale.editBox:GetText();
                yscale = yscale.editBox:GetText();
                origin = origin:GetSelection();
            };
        end
        
        return ui;
    end;
    CreateDescriptor = function()
        return {
            feature = "animation_scale", version = 1,
            name = "Scale", owner = "Base", duration = 10, xscale = 1, yscale = 1,
            origin = "CENTER",
        };
    end;
});

This has the same issue with moving unit frames as the rotation code I posted above.