var marketType =
                (await crest.GetRoot().QueryAsync(r => r.MarketTypes)).Items.Single(i => i.Type.Name == "Plagioclase");
            var itemType = await crest.LoadAsync(marketType.Type);
            var marketGroup = await crest.LoadAsync(marketType.MarketGroup);
            var itemIcon = await crest.LoadImageAsync(marketType.Type.Icon);

        
MarketTypeInformation GetMarketTypeInformation(MarketTypeCollection.Item marketType)
        {
            MarketTypeInformation info = new MarketTypeInformation();

            var itemType = eveCrest.LoadAsync(marketType.Type);
            var marketGroup = eveCrest.LoadAsync(marketType.MarketGroup);
            var itemIcon = eveCrest.LoadImageAsync(marketType.Type.Icon);

            while (itemType.IsCompleted == false || marketGroup.IsCompleted == false || itemIcon.IsCompleted == false) ;

            info.itemType = itemType.Result;
            info.marketGroup = marketGroup.Result;

            using (var ms = new MemoryStream(itemIcon.Result))
            {
                info.icon = Image.FromStream(ms);
            }            

            return (info);
        }

public async Task MarketTypeInformation GetMarketTypeInformationAsync(MarketTypeCollection.Item marketType)
{
    var info = new MarketTypeInformation();
 
    var itemType = eveCrest.LoadAsync(marketType.Type);
    var marketGroup = eveCrest.LoadAsync(marketType.MarketGroup);
    var itemIcon = eveCrest.LoadImageAsync(marketType.Type.Icon);
   
    using (var ms = new MemoryStream(await itemIcon))
    {
        info.icon = Image.FromStream(ms);
    }            
 
    info.itemType = await itemType;
    info.marketGroup = await marketGroup;
   
    return info;
}
 
public async void DoStuffAsync()
{
    var marketTypeInfo = GetMarketTypeInformationAsync();
   
    //
    //do stuff here that doesn't require the value/result of marketTypeInfo
    //
   
   
    //
    //await for the result
    //
   
    var marketTypeInfoResult = await marketTypeInfo;
}

public async Task GetIcon() {
            var item = (await crest.GetRoot().QueryAsync(r => r.MarketTypes)).Items.First();
            var icon = await crest.LoadImageAsync(item.Type.Icon);
}

eveCrest = new EveCrest();

From my log text...

Creating EveCrest object.
Exception: System.MissingMethodException: Method not found: 'System.String eZet.EveLib.Core.Config.get_AppData()'.
   at eZet.EveLib.EveCrestModule.RequestHandlers.CachedCrestRequestHandler..ctor(ISerializer serializer)
   at eZet.EveLib.EveCrestModule.EveCrest..ctor()
   at EveCrestContest.frmMarketItems.frmMarketItems_Shown(Object sender, EventArgs e) in C:\EveCrestContest v1.0.0.4\EveCrestContest\frmMarketItems.cs:line 49

Creating EveCrest object.
Exception: System.MissingFieldException: Field not found: 'eZet.EveLib.Core.Config.Separator'.
   at eZet.EveLib.EveCrestModule.RequestHandlers.CachedCrestRequestHandler..ctor(ISerializer serializer)
   at eZet.EveLib.EveCrestModule.EveCrest..ctor()
   at EveCrestContest.frmMarketItems.frmMarketItems_Shown(Object sender, EventArgs e) in D:\EveCrestContest v1.0.0.4\EveCrestContest\frmMarketItems.cs:line 49